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Available-For-Sale Securities (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accounts Receivable | $ 25 | $ 8
Accounts Payable | 22 | 5
Rabbi Trust [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accounts Receivable | 2 | 5
Accounts Payable | $ 0 | $ 3

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- Details
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- Details
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